It has been tested on an actual DS, so I'm sure it's not the emulator's fault. All I have done was edit the image: It works fine. but when I pause the game and go back... It's an LZ77 compressed image but I've recompressed it back after editing. There was no weird process; it was just a extract -> decompress -> edit -> recompress -> insert It happens on ALL of the images. but when I do something else and go back to the screen, it's normal again. another example: http://mfiles.naver.net/66b453889dccab1d33...%BF%F8%BA%BB.lz this is the original file. The file is set up in this way: 0000 ~ 0004 = Magic stamp 0004 ~ 0008 = Palette pointer 0008 ~ 000C = ?? 000C ~ 003C = Pointer information. Needs editing after image is edited. 003C ~ 023C = Palette. This is the palette of all 6 sub images. and then comes the 6 strips of LZ77 compressed images. As you can see in the 3rd screen, both top screen and the bottom screen uses the same picture. So I don't think it's the edit that went wrong, because if I used the wrong palette, all of the same color would be shown as black. And now here is the edited file: http://mfiles.naver.net/64b6518a9fcea91e39...%BC%F6%C1%A4.lz can someone take a look to see if it's the editing that went wrong, or if something else could have happened?